Fdil Khaoula, Michaud-Belleau Vincent, Hébert Nicolas Bourbeau, Guay Philippe, Fleisher Adam J, Deschênes Jean-Daniel, Genest Jéróme
Opt Lett. 2019 Sep 1;44(17):4415-4418. doi: 10.1364/OL.44.004415.
An approach for dual-comb spectroscopy using electro-optic (EO) phase modulation is reported. Maximum-length pseudo-random binary sequences allow for energy-efficient and flexible comb generation. Self-correction of interferograms is shown to remove relative comb drifts and improve mutual coherence, even for EO combs derived from the same laser source. Methane spectroscopy is reported over a ∼10 GHz spectral range, limited by the modulators' bandwidth. The potential of a simple EO comb instrument is demonstrated to rapidly quantify atmospheric methane emissions with ppb precision over 1 km.
报道了一种使用电光（EO）相位调制的双梳光谱方法。最大长度伪随机二进制序列允许高效节能且灵活地产生频率梳。结果表明，干涉图的自校正可消除相对频率梳漂移并改善相互相干性，即使对于源自同一激光源的电光频率梳也是如此。报道了在约10 GHz光谱范围内的甲烷光谱，其受调制器带宽限制。展示了一种简单的电光频率梳仪器在1公里范围内以ppb精度快速量化大气甲烷排放的潜力。
